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If this is in a RV the propane monitoring valve may require more gas flow to turn on than the water heater requires. A central heating system requires substantial gas flow so when the monitoring valve opens to fire the central heating, there is enough gas flow to also fire the water heater.

that would indicate that the boiler is not firing up
If oil fired, been there done that
it is out of oil
the oil filter is clogged
the nozzle could be clogged/burned
the igniter wires need adj/replacement

Symptoms sound like crossover might be part of problem:Crossover is when cold water enters hot water line due to faulty plumbing part like check valve, mixing valve, or bad faucet cartridge.http://waterheatertimer.org/Crossover.html

If you are using more than one heat source you will have 1 more pump than the heat source pumps
Main pump = SYSTEM pump pumps through the indirect hot water system and back into itself. This is the system loop.
The other two boilers tee into this loop upstream of the indirect tank, downstream of the SYSTEM pump.
The cold water return to each boiler tees into the system loop next to and upstream of where the hot water for that boiler tees into the system the loop.
The oil boiler will have its own pump on its return line from the sytem loop and the solid fuel boiler will have its own pump. When any boiler fires, it turns on its own pump AND the system pump.
If you want a drawing email me -pipesster@gmail.com send a fax number and I'll fax you a drawing.

Hi,
The problem is probably with the circulator pump or the zone valve, which ever way your water circulating from the boiler is controled.
The water needs to be moved through the boiler and the coils in the Hot water maker to heat water. If this is not happening then no water will be heated.
Check for power and then is the pump is running or the zone valve opening.
I hope that this will help you to solve your problem!